c 异步中断服务器连接,异步连接和断开与epoll（Linux）
我有一個(gè)“完整”的答案在這里以防別人正在尋找這樣的：
#include
#include
....
....
int retVal = -1;
socklen_t retValLen = sizeof (retVal);
int status = connect(socketFD, ...);
if (status == 0)
{
// OK -- socket is ready for IO
}
else if (errno == EINPROGRESS)
{
struct epoll_event newPeerConnectionEvent;
int epollFD = -1;
struct epoll_event processableEvents;
unsigned int numEvents = -1;
if ((epollFD = epoll_create (1)) == -1)
{
printf ("Could not create the epoll FD list. Aborting!");
exit (2);
}
newPeerConnectionEvent.data.fd = socketFD;
newPeerConnectionEvent.events = EPOLLOUT | EPOLLIN | EPOLLERR;
if (epoll_ctl (epollFD, EPOLL_CTL_ADD, socketFD, &newPeerConnectionEvent) == -1)
{
printf ("Could not add the socket FD to the epoll FD list. Aborting!");
exit (2);
}
numEvents = epoll_wait (epollFD, &processableEvents, 1, -1);
if (numEvents < 0)
{
printf ("Serious error in epoll setup: epoll_wait() returned < 0 status!");
exit (2);
}
if (getsockopt (socketFD, SOL_SOCKET, SO_ERROR, &retVal, &retValLen) < 0)
{
// ERROR, fail somehow, close socket
}
if (retVal != 0)
{
// ERROR: connect did not "go through"
}
}
else
{
// ERROR: connect did not "go through" for other non-recoverable reasons.
switch (errno)
{
...
}
}
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